Translation:

49. Hast thou not turned thy vision to those who claim sanctity for themselves? Nay but Allah doth sanctify whom He pleaseth but never will they fail to receive justice in the least little thing.

Notes (Tafseer)

570. The sanctimonious or self-sanctified people are the farthest from sanctity or purity, which can only proceed from Allah. They cannot play with Allah's Truth and yet go on claiming to be guided and purified or justified by Allah. Their falsehood in itself condemns them: no further proof is needed of their selfishness and evil.

571. Literally, the small skin in the groove of a date stone, a thing of no value; fatil.